Correct me if I'm wrong, but this tax is levied on all flights taking-off from or landing at UK airports, right? Therefore if, as a Brit, I choose to fly longhaul from my home base in Switzerland and I go via LHR I get hit with the tax. And If I choose to go e.g. via FRA or CDG I don't. Therfore Luftie or AF have a distinct advantage over BA for flight arrangements originating in mainland EU to US or Asia. I know which route I will take and it's not via London. I think that is going to have a greater effect than on those of you living in the UK who will have to pay the tax anyway to get out of good 'ole Blighty.